Crankshaft grinding machine



'July 23, 1.946 A. G. lBELDEN ETiAL 2,404,613

CRANKSHAFT GRINDING MACHINE Filed March 2, 1944 s'sheets-sneet 1 Y Nh,NON

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Filed March 2, 1944 July 23, 1945 A. G. BELDr-:N ET AL -CRANKSHAFTGRINDING MACHINE Filed March 2, 1944 5 Sheets-Sheet 3 gl-'75.5 JHG'. Z4,www n .ALBERT G'. BELIJEN E LTI DIVA E.H1AL.1 www CARL. E'. F'LYGAREJUIYZ3, 1946. A. G. BELDN ET Al. 2,404,613v

CRANKSHAFT GRINDING MACHINE Filed March 2, 1944 5 sheets-sheet 4 v -D/VAE. H`lz l H915 @www July 23, 1946- A. G. BELDEN ET AL l 2,404,613

GRANKSHAFT GRINDING MACHINE Filed March 2, 1944 5 Sheets-Sheet 5 0 206202 4 5 45/f2 [Q Z 2U f' e. Z 2f] J 221 236 221VJl 241 224 2 DIVA' E.H/Ll.

-Z QI-BERT 'E'. EESLJJEN" EARL El'. FLYGARE.

Patented July 23, 1946 cRANKsHAFT GRINDING MACHINE Albert G. Belden,Carl G. Flygare, and Oiva E. Hill, Worcester, Mass., assignors to NortonCompany, Worcester, Mass., a corporation of Massachusetts ApplicationMarch 2, 1944, Serial No. 524,736

14 Claims., (Cl. 51-72) This invention relates to grinding machines, andmore particularly to a crankshaft grinding and regrinding machine forgrinding or regrinding the crankpins and main bearings of a crankshaft.

One object of the invention is to provide a simple and thoroughlypr-actical crankshaft grinding machine. Another vobject of the inventionis to provide a crank grinding machine in which a crankshaft may bereadily positioned in the ma-f chine for grinding or regrinding thecrankpins and bearings thereon. l

Another object of this invention is to provide adjustably positioned potchucks for supporting the opposite ends of a crankshaft in which the potchucks are provided with a diametric adjustment whereby the crankshaftto be ground may be readily positioned for grinding crankpins of apredetermined diameter and throw; Another object of the invention is toprovide an adjustably mounted pot chuck for supporting a crank-- shaftfor a grinding operation, in which the pot chuck is adjustable along adiametric line relative to its axis of rotation and to provide the potchuck with precision means whereby the pot chuck may be readily adjustedto position the chuck for supporting a. bearing of a known diameter sothat the crankpin or main bearing to be ground may be positionedconcentric with the axis of rotation of the chuck so as to grind thecrankpin to the desired diameter and throw.

A further object of the invention is to provide a pot chuck having a.diametric adjustment whereby the pot chuck may be adjusted relative tothe axis of rotation of the chuck to facilitate grinding crankpins ofdesired throws and in which the chuck is also provided with a lateral ortransverse adjustment substantially normal to the diametric adjustmentto facilitate positioning the pot chuck for supporting a crankshaftYwith its axis coinciding with the yaxis vof rotation of the pot chuckfor grinding the main bearings of the crankshaft. e

Another object of the invention is to provide a pot chuck having aclamping strap to hold the Work piece in position in which the fulcrumpoint for the clamping strap is adjustably supported. Another object ofthe invention is to provide a clamping strap having an adjustable pivotpoint with means for inverting the position of the strap so as toaccommodateV either relatively large or relatively small diameter workpieces in the pot chuck. 1

A further object of the invention is to provide an improved steadyrestwhichY also serves as a crankpin indexing or positioning mechanism. Afurther object of the invention is to provide a steadyrest with agraduated scale whereby the horizontally movable steadyrest shoe may beprecisely positioned for locating a crankpin of a known diameter inposition before the shaft is clamped in the supporting pot chucks.

Another object of the invention is to provide the steadyrest with-avisible indicating mechanism whereby the concentricity of the crankpinrelative to the axis of rotation kof the supporting pot chucks may bereadily determined. A further object of the invention is to providesucha gauging apparatus on the steadyrest whereby visible indication maybe had of the crankpin as it is ground or reground to indicate thediameter thereof. Other objects will be in part obvious or in partpointed out hereinafter.

The invention accordingly consists in the features of construction,combinations of elements, and arrangements of parts, as will beexemplified in the structure to be hereinafter described, and the scopeof the application of which will be indicated in the following claims.

In the accompanying drawings in which is shown one of various possibleembodiments of the mechanical features of this invention,

Fig. 1 is a front elevation of an improved crankshaft grinding machineembodying this invention;

Fig. 2 is a fragmentary cross section, on an enlarged scale, takenapproximately on the line 2 2 of Fig. vl, showing the headstock potchuck in elevation; I

Fig. 3 is a fragmentary vertical sectional View, taken approximately onthe line 3-3 of Fig.'2, through theheadstock pot chuck; v

Fig. 4 is a fragmentary sectional View, on an enlarged scale, takenapproximately on the line..

4-4 of Fig. 2, through the pot chuck locating plunger; Y

Fig. 5 is a horizontal sectional view, on a reduced scale, takenapproximately on the line 5--5 of Fig. 2, showing the drive for theheadstock pot chuck;

Fig. 6 is a fragmentary elevation of the headstock pot chuck, as shownin Fig. 3;

Fig. 7 is a fragmentary plan view of the footstock pot chuck; f

Fig. 8 is a fragmentary vertical sectional view, on an enlarged scale,taken approximately on the line 8-8 of Fig. V1, showing the footstockpot.

chuck in elevation;

Fig. 9 is a fragmentary vertical sectional view, taken approximately onthe line v9--9' of Fig. 8 through the footstock pot chuck;

Fig. 11 is an enlarged view of thel calibrated I scales on the headstockpot chuck, showing the setting of the scales for positioning theheadstock pot chuck; Fig. 12 is a similar enlarged view, von a reduced'scale, of the calibrated scales on the footstock pot chuck, showing thesetting of the scales for positioning the lfootstock pot chuck;v

Fig.. 13 is a fragmentary crosssectional view, on an enlarged scale,taken approximately on the;

line I3|3 of Fig. 1, showingthe combined steadyrest and crankpinaligning and gauging mechanism in end elevation;

Fig. 14 is a plan of the combined steadyrest crankpin aligningandgauging mechanism;

Fig.- 15 is a fragmentary horizontal sectional view,.on an enlargedscale, 'taken approximately Fig. 16 is a fragmentary' cross sectionalview, taken approximately on the' line.| 6| 6 of Fig. 13;

Fig. 17 is a cross sectional view, on an enlarged scale, takenapproximatelyon` the line |1-l1 ofFig.13;V Y Y Fig. 18 is a fragmentaryside elevation, on an enlarged scale, showing the stop screw and scale;VFig. 19 is a fragmentary elevation, on an enlarged scale, .showing thescale calibrated in inches of crankdiameter for positioning and aligningthe cra'nkpins; Y

Fig.V 20 is a fragmentary vertical sectional View, on a reduced scale,taken approximately on the line 20-20 ofFig. l14;

Fig. 21`is a, fragmentary sectional View, takenv approximately on` theline 2|-2| of Fig. 13;

22 is a vertical sectional View, onV an enlarged scale, through thefootstock;

Fig.v23is an'en'd elevation of amoclied potV chuck, on a reduced scale,showing an adjustment lforthe -pot chuck; and

Fig. :24 is a front elevation, on an renlarged scale, of the pot chuckshown in Fig. 23. ATheimprovedcrankshaft grinding machine has and frontof the machine base. This type of feeding mechanism is old an-d wellknown in the art and is substantially the same as that shown in theexpired patent to C. H. Norton No. 762,838 dated.4

June 14, 1904, and consequently has lnot been illustrated and describedin detail. For details of disclosure not contained herein, reference maybe had to the above mentioned expired patent.

The wheel slide 3| serves as a support for a rotatable grinding wheel 35which is mounted on the left-hand end of a rotatable wheel spindle 36which is journalled in suitable bearingsI (not shown) within the wheelslide 3|. The grinding wheel 35 is preferably driven by an electricmotor 31 mounted on the upper surface of the grinding wheel slide 3|.The motor 31 is provided with a multi-V-groove pulley 38 which isconnected by multiple V-belts 39 with a multi-V-groove pulley 4U mountedon the right-hand end of the wheel spindle 36. Y

'I'he work supporting table 2| serves as a Isup port for a headstock 4|and a footstock 42 which are arranged rotatably to support a crankshaftbeen `illustrated in the drawings comprising a Y base 20 which supportsa longitudinally movable work supporting table 2| which is arranged toslide longitudinally relative to the base 26 on a V-way v22 anda flatway 23 (Fig.2 The table 2| may be moved longitudinally by .means of amanually operable hand traverseV mechanism whichl is substantially thesame as .that shown in the expired U. S. patent to C. H. Norton, No.1,299,765 dated April 8, 1919. This traverse mechanism Amay comprise ahand wheel 25 which is operatively Yconnected to rotate a small gear 26.

The small gear 26 meshes with a larger gear- 21 g whichuis supported ona shaft 28. The shaft 2S also supports a gear 29 which meshes with arack bar 30 depending from the underside of the table 2|. It will bereadily apparent fromfthe foregoing disclosurethat the table 2| may bereadily traversed and positioned longitudinally by manual rotation ofthe traverse wheel 25. The direction'of rotation of the hand wheel25determines theA direction of movement vof the tablevZl.-

A transversely movable grinding wheelslide 3| is arranged toslidetransversely relative to the base 2D of a V-Way 32 and a flat Way33.5The usual and'wellknown nut and screw feed mechanismis-providedfor'adjusting the wheel slide 43 for a predetermined grindingoperation.

The headstock 4| is preferably a motor driven headstock in which a faceplate 45 isxedly mounted relative to a multi-V-groove pulley 46 which isjournalled by suitable anti-friction bear- Y ings 41 and 48 adjacent tothe right-hand end of a non-rotatable headstock spindle 49 (Figs. 1 and5). An electric motor 50 is mounted on the upper surface of theheadstock 4I. .The motor 5|). is provided with a multi-V-groove pulley5| which is connected by multiple V-belts 52 with -a multi- V-groovepulley 53. The pulley 53 is supported by an anti-friction bearing 54which is in turn'supported on an eccentrically mounted' adjustablesleeve 55 projecting from the left-hand of the headstock 4| (Fig. 5). -Amulti-V-groove pulley 56 is iixedl'y mounted relative to the pulley 53and is journalled at its left-hand end by ananti-friction bearing 51.The anti-friction bearing 51 is supported on the left-hand end of thesleeve 55. The pulley 56 is connected by multiple V-belts 58 with amulti-V-groove pulley 59 which is keyed to the left-hand end of arotatable shaft 60. VThe shaft 60 is journalled in anti-frictionbearings 6| and 62 which are in turn supported in anadjustably mountedeccentric sleeve 63 in the headstock frame. A multi-V-groove pulley 64is keyed to the right-hand end of the shaft 60 and is connectedbymultiple V-beltfs` 65 to-the multi-V- groove pulley 46 whichcarriestheface plate 45. The face plate 45 serves as asupport for an adjustablymounted work supporting pot chuck to be hereinafter described.

The footstock 42 (Fig. 221) -is-provided with a f slidably mountedsleeve 68 which serves as a support for anti-friction bearings 69 and10.V The anti-friction bearings 69 and 10 serve asa support for arotatable spindle 1| having formed integrally therewith a flange 12which supportsY Y crankshaft which is tobe supported thereby.

transversely relative to the base comprising a f i manually operablefeed wheel 34V mounted on the vA' binder screw 14 is provided to clampthe footstock sleeve 68 in adjusted position.

The headstock pot chuck (Figs. 2,3 and 6) Meernon the `adjusting screw|05. l :is preferably graduated to `fa':ilitate precise ad- 1justment ofthe position of the slide 589-. After in a diametricallyarranged keyway83 (Fig. 2). The plate 80 is accurately located and centered relative tothe face plate 45, after which it is located by dowel pins and isclamped in position thereon by screws 84 and 85. The chuck plate 80 isprovided with a diametrically arranged dovetailed slideway 88 which isarranged substantially at right angles to the keys 8| and '82. Thedovetailed slideway 88 is xedly mounted on the plate 80. A transverselyYmovable pot chuck slide 89 is provided' with a dovetailed slidewaymating with the dovetailed slide 88. Additional slideways and guideways90 and 9| are; arranged to engage slide surfaces92 and 93 Von the outeredges of the slide 89 (Fig.2)

The pot chuck slide 89 is provided `with work supporting plates-94 and95 which are flxedly mounted thereon and are arranged to form a V`shapedwork supporting surface to support a crank bearing 96 adjacent to theleft-hand end of the crankshaft 43. A clamping strap 91 is pivotallymounted at one end on a stud 98.` The other end of the clamping strap 91isf provided with a substantially U-shapedA notch 99l`which isengaged bya pivotally mounted clamping screw The clamping screw |00 is pivotallysupported on a stud I0| which is in turn'xedly mounted on the pot chuck`slide 89. The clamping screw |00 is threaded at its upper end and isprovided with a nut |02 by means of which the strap 91 may be clamped tohold the main bearing 96 rigidly in vposition on the V-shaped,supporting surfaces 94 and 95. n Y

In order to facilitate adjustment yof the chuck, to accommodatedifferent sizes of bearings on crankshafts, it is desirableto provide anadjustable vsupport for the pivot stud 98. In Ythe-preferredconstruction, the stud 98 is supported on the upper end of a screw |03which is screw threaded into a portion of the pot chuck slide 89. Thescrew |03 is held inv adjusted position by means of a lock nut |04.lWhen it is desired to release the main bearing 96, the' nut |02is'loosened. and the clamping screw |00 swung in a counterclockwisedirection after which' the strap 91 may be vswung in a clockwiser'direction into broken line position 91a.

If it is desired to adjust the position lof thepivot *stud 98 so as tovary the capacity -of the chuck,

the clamping strap 91 is swung to' a` vertical position in alignmentwiththe axisof the Vscrew |03, in which position the strap y91 may beturned in either direction torotate .thescrew |03 'so as to raise orlower the position of the pivot stud 98, after which the screw |03 maybe locked in adjusted position by the lock nut |04. 4

In order to `facilitate adjusting the pot chuck diametrically relativeto the axis of the headstock spindle, a rotatable adjusting screw |05 isrotatably supported' in a bearing|06 formed in an' end cap |01 which isiixedly mounted on the end of the dovetailed slide member 88. A pair ofcollars |08v and |09 are arranged above and below the end cap |01 andare pinned to the screw |05 so as to hold the screw against endwisemovement relative to the end cap |01. The screw |05 engages a threadedaperture ||0 formed in the potchuck slide 89. It will be readilyapparent from the foregoing disclosure that the slide A89v l may bereadily adjusted in a diametrical direction relative to the axis of theheadstock spindle by applying a wrench to a hexagonally shaped end Thecollar |08 predetermined position, the slideways'or vguides and 9| maybe clamped rigidly in position to lock the slide 89 into a fixedposition relative `to the pot chuck plate 80.

To facilitate adjusting the chuck and regrinding crankshafts` havingcrankpins and 'main bearings of different diameters and throws, a pairof graduated scales are provided, as shown in Fig. ll. A bearingdiameter scale |I5 is fixedly mounted on the pot chuck slide 89. Thisslide is calibrated to read inches bearing diameter of the main bearingofthe crankshaft to be ground. A throw scale |I6 is xedly mountedrelative to the pot chuck plate 80. The scale |I6'is calibrated to readinches of throw of the crankpins to be ground. The main bearingl 96A ofthe crankshaft 43 is 2%" in diameter and the crankpin throw of thecrankshaft is 2%, consequently'theposition of pot chuck slide 89 isadjusted so that 2%" 0n the bearing diameter scale coincides with 21A onthe throw scale, which serves precisely `to locate the slide 89 with thebearing surfaces 94 and A95 in proper position to support the mainbearing '96 for a grinding operation on a crankpin. After the slide 89is thus adjusted, the slide may be clamped in adjusted position, asabove indicated.V l

In order to locate the pot chuck in a vertical or loading position, aspring-pressed plungeror detent I I8 lis provided and arranged to engagea notch I|9 formed in or iixedly mounted on the periphery of the potchuck plate 80 (Fig. 2). The spring-pressed detent I I8 is supported bya brack-l et |20 which is adjustably clamped to the table 2|.The's'pring-pressed detent ||8 is normally held in engagement with thenotch I9 by means Aof a spring |2I. An actuating knob |22 is provided bymeans of which the detent I I8 may be withdrawn to an inoperativeposition and held in an inoperative position by means of a pin |23 afterthe knob |22 has been withdrawn toward the left (Fig. 2) and turned sothat the pin |23 engages an end face on the bracket |20. An adjustablymounted counterbalance weight |25 is supported on the dovetailedslideway 88.

In supporting crank bearings of a relatively large diameter, theclamping strap or arm 91 may be inverted and positioned as shown in Fig.l0. In order to invert 4the strap 91, the strap is moved to a verticalposition and turned about the axis of the screw |03 a's'apivot and thenswung into the position shown in Fig. 10. It will 'be readily apparent,'as previously described, that the position of the pivot stud 98 for theclamping strap 91 may be adjusted vertically by positioning the strap 91in a vertical position and then rotating the same to adjust .the screw'I 03 as desired.

A 'similar pot chuck is provided on the footstock 42 for supporting theright-hand end of the crankshaft 43, as shown in Fig. 1. This pot chuck(Figs. '1, 8 and 9) is substantially iden-tical with the headstock potchuck, consequently it will not be described in as much detail. Thefootstock pot chuck comprises a supporting plate |30 either fixed or`adjustaloly "mounted on the flange :12, which is provided withadiametrically arranged dovetaile'd slideway |3|. A pot chuck slide |32is provided having a dovetailed slideway which mates with the slideway|'3|. The slide |32 serves as a support for work supporting plates |33and |34 which are arranged to form a V-shaped support for a cylindricalportion |35 formed at the l right-,handend'of the v4crankshaft 43. ySideguides orslid'ewaj7 blocks 4|36 and |31 are provided to SUP- or head |43ofthescrew |3 8 .the screw maybe 10 readily rotated to. adjust theposition of the slide |32'in a diametrical direction. A clamping strap|44 is pivotallymounted at one, end by a studV |45. Thestud |45 is inturn supported lby a screw |46 whichiis 'threaded intoaportion of theslide |32 15 and is held inadjusted position relative thereto by meansyof a check nut |41. It Awill be readily apparent from the foregoingdisclosure that' the position of the pivot |45 forthestrap |44 may bereadily adjusted to Aaccommodate various di- 0 ameters formed on theright-hand end of acrankshaft. i

The clamping strap |44 is provided with a swbstantially U-shaped notch|48 at its right-hand endY (Fig. 8). YA clampingscrew |49 is pivotally25 supported by a stud |50 which isin turn fxedly supported relative to;the pot chuck slideV |32.` When the clamping strap |44 is moved into' anoperative positionV (Fig. 8), the clamping screwv |49 may be swung in acounterclockwise 4direc- 30 tion into fthe Apositionillustrated'in Fig.8, after which a clamping nut |5| may b'e tightened `4to clamp the strap|44v to rigidly support the por-g tion-| 35 ofthe crankshaft 43 inA anoperative posi-'- tion. An adjustably vpositioned counterbalance 35weight |52`is also provided whichis supportedon the dovetailed slideway.|3|.

In order .to locate the pot Ychuck plate 30 in` a vertical or loadingposition, a spring-pressed detent |55 ,is arranged to engage a notch |55.m

which is supported in fixed relationshipwith the pot chuck plate |30.The detent |55 is supported 1 by abracket |51 which is arranged-tobeadjustably clamped onto the upper surface of the table 2|. A spring|58-normal1y tends to hold the de- ,45

.tent |55 inv-engagement with the notch |56. Y An actuating knob |59 isprovided whereby the detent may be manually withdrawn to an inoperativepositionwhen desired.

l :In order to `time the chuck plate |30 with the 5,0 chuckplate 80, -itis desirable to provide a suitable'y adjustment wherebyone of thepot'chucksmay be angularly adjusted relativeto the other. As illustratedinthe drawings, the notch |55 is prefert ably-fome@ in a block leo whichis adjustably clamped in position onthe chuckplate |30 by apairofscrewsll and |62. vThe'screwsl6l and |62 pass through elongated slotsformed in the lblock |60. l AA pair of opposed adjusting vscrews |63 and|64 are provided which are screw thread- 60 ed into portions of thechuck plate |30 and engage `the opposite Vend faces of the'block |60. Itwillbe readily apparent that by releasingY the screws :|6I and |62 andadjusting the screws |63 and |64,- the chuck plate |30 vmay .beVvreadily ade5 justed relative to the chuck plate 80 as desired.

In order to facilitate precise adjustmentl of j. the pot chuck slide|32, graduations are provided on the collar |40 to facilitate adjustmentof the screw |38. A throw scale V| 65 is mounted on or xedly supportedby the chuck plate |35. l A i'learingV diameter scale`l lt'isY xedly.supported 'onthe slide |32 (FigQl'Zf). In accordance .with the settingillustrated in Figs 1 8, 9i and 1 -12,'-the portion |35 o1 thecrankshaft-43 isjl 1/{1' 75 ,in` diameter and the throw of the crankpinsto' be ground is 2%."f, consequentlythe slide |32 isladjusted until1 1/aon thescale |66 is opposite 21A on the throw scalein which position the5 vV,shaped supportingY members |33 and |34 will supportthe portion |35at the right-hand end of the crankshaft 43 in a precise position toIloczate the mainaxis of the crankshaft in the desired ofsetrelationwith the axis of rotationl thereof so that the axesof the crankpins l |1and |10 will coincideY with the axis V of `rotation of ythe pot chucks.and |30.l i

Incase it is desiredto set the pot chucks to support the main bearings'of the crankshaft 43 in alignment withy the axis of rotatiorrfof thechucks, it is desirable to provide an adjustment whereby the pot chuckmaybe adjusted in a lateral direction, that is, normal to thedirectionbf slide adjustment of the chuck for producing'the desiredthrow. fAs illustratedin the modication shown in Figs. 23 and 2 4, thepot chuck plate`80 is providedwith ya, slightly lateral"adjustrnentrelative to the face plate 45. A pivot'stud |80 passes through the plateandV also through the f faceplate 45. A pair of clamping boltsv |`8| and|82 pass through closely v1 itting`lioles the pot chuck plate 8 0 andthen through clearance holes |83and |84, respectively, in the.face"p1ate`45. `It

will be readily apparent from the foregoing`dis` closure that the potchuck Yplate 8 0 may be swung in a lateral direction about the axis vofthe bolt or stud |80 as yapivot. The 'extent of'lateral adjustment islimited by the clearancev provided .inthe holes |83 and |84. ToAfacilitate a precise vlateral adjustment of the'plate |80,V a stud|85 is'iixedly mounted in the pot chuck plate 80 and extends through anotch|86 provided'idtheface plate45. A pair of opposed adjustingscrewsf|81and |88 arescrew threaded into portions |89 and ,|90 of the face plate45. The ends of the screws |81 andr |88 are arranged toenga'ge the stud|85 en diametrically opposite sides. If a lateral adjustment ofthe potchuck is desired, the clamping bolts |8| and |82 may beY loosened and byVmanipulation of the adjusting screws |81 and l 88, the pot chuck plate80 may be swung through a limited distance either in a clockwiseor'c'ounterclockwise direction (Fig. 2'3) `a fter"which thepotchuckfplate may be clampedrigidly to the face plate 4.5by means oftheclamping bolts |80, I 'l and- |82. "A similar' lateral adjustmentvmay also be provided for thepot chuck plate |30, .toVfacilitateadjusting the plate |30 Ylaterally.relative to the flange 12.

In grinding a crankshaft such as that shownin Fig. 1, it is desirable-to provideV suitable steadyrests for steadying the orankpins to beVground. In the preferred.constructiomtwo steadyre'sts are employed, onepositioned to steadyand support the `crankpin ||1 and th'e otherto'steady and support the 'crankpin I 10 (only one steadyrest Vbeing.illustrated in the drawings) A steadyrest .frame 200 is providedwithAsuitable clamping means for removably clamping the steadyrest frametothe upper surface of the tableZl. The steadyrest frame 20|)v supportsa horizontally adjustabley Vslide l20| which in turn 'supportsv asteadyrestshoe 202. -A rotatable adjusting screw 203v is providedfortransverseiy .'adjustingjthef 70` slide 20| of the steadyrest shoe202 relative to the steadyrest frame 200.'."Ihel screw 203 is screwthreaded into a threadedaperture -204 formed within the slide 20|.Amanually 'operable hand wheel-2051s provided for adjusting'fthe screwAand aereaasparaginepareggiare gefeest 9. shoe 202. A second or lowersteadyrest shoe 206 is arranged to engage the work piece at a pointbelow the work axis and at a point adjacent to the line of contactbetween the wheel `and the work piece to be ground. The shoe 208 issupported by an arm 201 which is pivotally supported by a stud 208. Adownwardly extending arm 209 is formed integral with the arm 201 sothatthe arms 201 and 209 form a bell crank lever. A-

rotatable adjusting screw 2| 0 is screw threaded through a threadedaperture 2|| formed in the steadyrest frame 200. The lower end of thescrew 2|0 engages a portion of the arm 209. A manually operableadjusting knob 2| 2 is adjustably mounted on the outer end of the screw2|0 and serves to facilitate adjustment of the steadyrest shoe 206.

It is desirable to provide a suitable crankpin aligning device so thatafter the pot chucks have been adjusted vertically for crank throw,crankpins may be indexed and positioned so that their axes coincide withthe axis of rotation of the pot chucks for a grinding operation. In theprewithin an elongated slot 238 formed inthe slide 22| (Figs. 13, 14 and15).v

In order to provide onlya` limited movement of the spindle 224 relativeto the slide 22|, an adjusting screw 238 is screw threaded into an endplate or plug 239 'fixed in the end `of the cylindrically shaped slide22| (Fig. 15). The screw 238 is provided with an enlarged head 240 whichengages a TK-shaped slot 24| which is formed inthe end of the spindle224. It should be noted that the T-shaped slot is provided withsuilicient clear-l ance relative to the head 240 ofthe screw 238 soferred embodiment of this feature, the horizon- Y tally movablesteadyrest shoe 202 is utilized to locate the crankpin to be ground in apredetertermined grinding position. The steadyrest` shoe 202 is providedwith a crankpin bearing shoe 2|5 which is preferably of a hardnon-wearable material, such as, for example, a hard cementedcarbide. Ascale 2 I6 is mounted on the side face of the steadyrest frame 200(Figs. 13 and' 19). The scale 2|6 is calibrated in inches diameter ofthe crankpin. An index pointer or` zero datum 2|1 is iixedly mounted onthe slide 20| and extends through an elongated slot 2|8 in the side faceof the steadyrest. The index pointer l2|1 is preferably located adjacentto the graduated edge of the scale 2| 8. The crankpin ||1 to be groundis 2" in diameter. Therefore, after the crankshaft 43 is positioned inthe pot chucks 89 and |32, the adjusting knob 205 on the steadyrest 200is rotated until the index pointer` 2|1 is opposite the 2" diametergraduation on the scale 2|6 (see Fig. 19). The crankshaft 43 is thenrotated manually until the crankpin |'|1 bears against the shoe 2|5after which the crankshaft is clamped in position in the pot chucks 89and |32.

In order to check the concentricity of the crankpin I1 to determinewhether or not it is adjusted absolutely concentric with the axis ofrotation of the pot chucks, a visible indicating mechanism isy providedwhich not only serves to check the concentricity of the crank pin beforegrinding but also serves visibly to indicate work size as the grindingoperation proceeds. Thisy mechanism may comprise a bracket 220 which isfixedly mounted on the upper surface of the steadyrest 200. The bracket220 serves as a support for a cylindrically shaped slide member 22|which. is slidably keyed within a cylindrical aperture 222 within thebracket 220 by means of a key 223. The cylindrically shaped slide memberY22| contains a slidably mounted spindle or plunger 224 the right-handend of which (Fig. 13) bears against an actuating plunger 225of a dialindir cator 226 which is mounted within a protective housing 221. Thehousing 221 is iixedly mounted adjacent to the end of the cylindricallyshaped slide 22| and is provided with a hinged ccverv223 by means ofwhich the dial indicator may be protected and covered when not in use. Aclamping screw 229 is provided forlocking the cylindrically shaped slidemember in the desiredl and predeas to allow a limited movement of theyspindle 224 relative to the cylindrically shaped slide 22 l..

During a loading operation,` thefcylindrically shaped slide 22| is movedtoward the right (Fig. 13) into an inoperative position so as to swingthe arm 23| and the contactV tip 233 in a clockwise direction into aninoperative position out of engagement with the work surface. After thecrank'- 'shaft 42 has been positioned inthe pot chucks 99 and |32 andthe crankpin l I1 rotated into engagement with the crankpin aligningsurface 2 I5', the pot chucks are clamped to lock the crankshaft 43 inan operating position-Before the grinding operation is started, vtheclamping screw 229 is loosened and the cylindrically shaped slide 22| ismoved toward the left to swing the arm 23| and the work engaging contactmember 233 in a ccunterclockwise direction into engagement with the worksurface into the position shown in Fig. 13. The pot chucks may then berotated manually so that the operator may observe by means'of the dialindicator whether or not the periphery of the crankpin A| |1l isconcentric relative to the axis of rotation of the pot chucks. If theoperator finds by such test'that the crankpin is slightlyvout. yof trueindexed position, that is, in a horizontal plane (Fig. 13), thepotchucks are stopped in the vertical vpositions shown in Figs. 2land 8,

the pot chuck clamping straps are released, and the adjusting knob 205is turned precisely to compensate for any out-of-.line condition of thecrankpin |1 in a horizontal plane. The periph# ery of the hub portion ofthe adjusting knob 205 is preferably calibrated in tho'usandths of aninch diameter of the pin so that suitable compensation may be made toalign the crankpin. After this compensation` has been completed,`thecrankpin |1 is again rotated relative to the pot chucks into alignmentwith the shoe. 2|5,` after `which itmay be clamped in adjusted positiony.within the pot chucks 89 and |32. Y v

If in testing concentricity of the. crankp`in.,` it

is found that a Vertical adjustment of the pinis necessari7 so that itsperiphery will run r'concentric, the pot chucks 89 and |32 lmay bevertically adjusted either up or down so that the periphery of thecrankpin ||1 willbe absolutely'concentric` with its axis of rotation. .Y*l

In order to prevent forcing the cylindrically shaped slide 22| rapidlyinto an operating posif tion with the work contact member 233 in engageeis arranged adjacent to an index line 249 formed on the bracket 220.

When the cylndrically shaped slider22| is moved into'an operativeposition, the, movement of thel slide toward the left the stop screw245. As previously stated, the crankpin ||1 is'2v" in diameter beforethegrinding operation, consequently the slide 24|:` is ad-` justed so thatther2" diameter reading on the scale 248 coincides with theindex pointer249. In this position of the'stop screw` 245, when it is desired to movethe gauging apparatus to an operative position, the screw 229`rnay beloosened and the cylindrically shaped'slide 22|` may be moved toward anoperative position,; this movement being limited by engagement of thecasing 221 withY the end of Vthe'stop screw 245.

After the work piece has been adjusted for concentricity, if desired thework engaging Vpoint 233 may be left in engagement with the periphery ofthe crankpin I1, so that the operator may read the reduction Vin size ofthe crankpin I1 as the grinding operation proceeds.

j The operation, of this improved `crankshaft Vregrinding Ymachine will'be ,readily apparent from the foregoing disclosure. vThe opposite endsof acrankshaft 43 to be ground or reground are measured-that is,'the endmain bearing surfaces thereof are measured, and the pot chucks areadjusted to position the pot chucksr for supporting the end ,mainbearings of the shaft in the proper position to grind crankpins of apredetermined throw. vThefpot chucks are adjusted as previouslydescribeduntil the bearing diameter on thescales coincides with the throwindicated'on thethrow scales, after vwhich the crankshaft to beground islplacedin position within thehucks. If necessary, the headstock or*footstock may lee adjustedlengthwise relative to the table 2 |V toadjust the pot chucksrlengthwise of The the Vmachine relative to the,crankshaft. clamping mechanisms for the headstock and footstock arecommon, well known expedients which have, been'used in the grindingindustryformany years. ,a The crankpin to be ground is thenmeas.-

urea anda steadyrest zou positioned on thetame 'i preferably. rotatedmanually to vtest for concentricity ofthe crankpin |11. After suitablecompensation has been made, if necessary, the crankshaft is locked inposition on the pot chucks Vfor a grinding-operation. The common typecrankfshaft, such as'illustrated in the drawings, usually has twocrankpins which are positioned in axial alignment with each other. AInYgrinding sucha shaft, two steadyrests are preferably emp1oyed,each ofwhich is a duplicate of that shown in Figs. 13 -and 14.Y One of these`stefadyrests 'wouldbe positionedin operative position relative to thecrankpin I1 and the other in oper- V(Fig. 13') continues until thecasingY 221 which surrounds the dial'indicator engages the end of 12 Yative position relativeto the crankpin' |10;` "By utiliaing the aligningand gauging'devices previously described, both Aof the' pot chucks 8S!vand |32 may be preciselyadjusted relative to the two crankpins which.are to be4 ground while the shaft is lin the same operating position.The grinding operation may then proceed with the gaugein an operativeposition, as illustrated in Figi4 13, and the crankpin ||7 may be groundto the desired and predetermined extent.

After the crankpin V| |1 has been ground, the grinding Wheel 35 may bemoved rearwardly Vto aninoperative position and the work table 2|traversed toward the left by manual rotation of the .traverse wheel,25so as to position theerankpin Y|10 in an operative Yposition relativeto the grinding wheel, 35. After both of the crankpins ||1 and |10 havebeen ground, the steadyrests may then be positioned oppositeV thecrankpins 42`|0and 21| and the crankshaft may then be released withinthe pot chucksd and`|32 so that the crankshaft 43may be rotatedinto anindexed Vposition so that crankpins 210 and 21| will have their axescoinciding'with the axis Aof rotation of the pot chucks.Y pins 210' and21| may be accomplished in the manner aboveV described in [connectionwith crankpins I|1 and |10, after Which the pins may be ground e to thedesired andpredetermined extent. Y

vided-by thisV invention apparatusl in which the various objectshereinabove v'set forthtogether with many thoroughly practicaladvantages are successfully achieved. As many possible embodimentsY maybeV made Vof the" above invention Vand as fmany changes might bemade inthe embodiment above set forth, it is to be understood that allinatterhereinbefore set forth orshovvn in the accompanying drawings is to beinterpretadas illustrative and not in a limiting'sense. i f

yWeolaim:Y *e Y Vl. In a crankshaft grinding'r'nachin'e having arotatable spindle, a face plate thereon, a pot chuck for supporting acrankshaft to be ground, afslide interposed` between said'pot chuck andsaid faceplatefto facilitate adjustment of "said pot chuck, meanstoadjust said pot chuckso that the axis of a crankshaft supportedthereby moves in aplane normaltofthe spindle axis,

and meansrto adjust the position of said slide relative to said AfaceYplatefsothat the vpath of adjustment of the axis of a crankshaftsupported by said chuckV to determine crank Ythrow passes through theaxis of saidspind1'e. e

2, Ina crankshaft grindingV machine, a roi tatable spindle having a faceplate fixedly mounted thereon, a plate having a slideway thereon whichis adjustably mounted on saidface plate, a pot chuck for supporting acrankshaft to be ground, a mating slideway on said pot chuck, saidslideways Vbeing arranged to adjust said pot chuck so that the axis of acrankshaft supported thereby'moves ina plane normal to saidspindlea'xisand means toY adjust the positionof said plate and slide relativeto saidface plate sothat the path of adjustment of the axis Vof a'crank-1 shaft supported by said chuck lies vin a pla-ne which coincides withthe axis of said spindle.,

3. In a crankshaft grinding machine having ay pair ofspaced alignedrotatable work spindles, a crankshaft supporting pot chuck on each ofsaid spindles, means precisely to adjust each `of said chucks in a pathnormal to the axis of said spindles. to facilitate grinding crankpinshaving The aligning of the vcrank- It willAt-husbe seen Athat therehas'been proa predetermined throw, and means laterally to' adjust eachof said chucks bodily in a direction substantially at right angles tosaid first adjustment so that the path of adjustment of the axis of thecrankshaft supported by said `chucks to determine Acrank throw passesthrough the axes of said spindles.

4."In a crankshaft grinding machine having a pair of spaced alignedrotatable spindles, a face plate fixedly supported on adjacent ends of'each of said spindles, an independent pot chuck' having a plateadjustably supported on each of said face plates, each of said potchucks having 'a diametrically adjustable slide on said latter plate, aV-shaped crankshaft support on each of said slides, means including'apivotally mounted jaw on each of said slides to facilitate clam-ping theopposite end of a crankshaft on said V-'shaped support, means preciselyto adjust each of said pot chuck slides in a path normal to the axes ofsaid spindles to facilitate grinding crankpins having a predeterminedthrow, and independent means laterally to adjust each of said pot chuckplates relative to said face plates bodily in a direction substantiallyat right angles to the movement of said slides so that the path ofadjustment of the axis of the crankshaft supported by said chucks todetermine crank throw `passes through the axes of said spindles.

5. In a crankshaft grinding machine havinga rotatable spindle, a faceplate fixedly supported thereon, a pot chuck including a crankshaftsupporting and locating surface, and a pivotally mounted clamping jawassociated therewith to clamp a crankshaft thereon, and an adjustablefulcrum stud for said jaw whereby the position of said jaw may beadjusted relative to said supporting surface to accommodate crankshaftsof different diameters.

6. In a crankshaft grinding machine having a rotatable spindle, a faceplate fixedly supported thereon, a pot chuck including a V-shapedsupport and a pivotally mounted clamping strap associated therewith toclamp a crankshaft thereon, and an adjustable fulcrum stud for saidstrap whereby the position of said strap may be varied relative to saidV-shaped supporting surface to accommodate crankshafts of differentdiameters.

'7. In a crankshaft grinding machine having a rotatable spindle, a faceplate fixedly supported thereon, a pot chuck including a crankshaftsupporting and locating surface and a pivotally mounted clamping jawassociated therewith to clamp a crankshaft thereon, an adjustablefulcrum stud for supporting one end of said jawv whereby the position ofsaid jaw may be adjusted relative to said supporting surface toaccommodate crankshafts of different diameters, a clamp.. ing screw onsaid chuck to clamp the other end of said jaw, said jaw being arrangedso that it may be readily inverted to facilitate supporting a crankshafthaving a main bearing of relatively large diameter.

8. Inra crankshaft grinding machine having a rotatable spindle, a faceplate xedly mounted thereon, a pot chuck adjustably supported on saidplate including a V-shaped crankshaft support and a pivotally mountedclamping strap to clamp a crankshaft therein, an adjustable fulcrum studfor one end of said strap whereby the position of said strap may bevaried relative to said support to accommodate crankshafts of differentdiameters, a clamping screw on said chuck to clamp the other end of saidstrap, means including a nut and screw precisely to adjust said potchuck in' a path normal to the spindle 9. In a crankshaft grindingmachine having a rotatable spindle, a face plate flxedly supportedthereon, a pot chuck having a plate adjustably mounted on said faceplate, said pot chuck having a diametrically adjustable slide on saidlatter plate, a crankshaft support on said slide, `means including apivotally mounted clamping jaw on said slide to facilitate clamping acrankshaft on said support, and precise means to adjust said slide tofacilitate supporting a crankshaft having a predetermined bearingdiameter and crank throw, said means including a graduated scale on saidslide'` calibrated in inches-diametermain-bearing, and a second scale onsaid chuck plate calibrated in inches-crankpin-throw to facilitateadjustment of the chuck for grinding a crankpin on a crankshaft having apredetermined throw.

10. In a crankshaft grinding machine having a pair of spaced alignedrotatable work spindles, a crankshaft supporting pot chuck on each ofsaid spindles, means precisely to adjust said pot chucks laterallyrelative to said spindles including a scale on each of said chuckscalibrated in inches-diameter-main-bearing and a second scale fixedrelative to each of said spindles calibrated in inches-crankpin-throw tofacilitate setting up said chucks for supporting a crankshaft havingcrankpins of predetermined throws, a crankshaft aligning mechanismincluding a frame, a horizontally adjustable shoe thereon, and precisemeans including a graduated scale calibrated in inchescrankpin-diameteron said frame and a zero datum on said shoe to facilitate preciselocation of said shoe for aligning a crankpin of a predetermineddiameter so that its axis coincides with the axis of said spindles.

11. In a crankshaft grinding machine as claimed in claim 2, thecombination with the parts and'features therein specied, of an adjustingmeans between said face plate and said pot chuck plate including a fixedpivot stud extending through both of said plates, a fixed stud on thesaid chuck plate located diametrically opposite thereto, said latterstud extending through a clearance aperture in said faceplate., and apair of aligned spaced adjusting screws on said face plate which arearranged to engage opposite faces of said fixed stud to facilitate alateraladjustment of said chuck plate relative to said face plate, saidlateral adjustment being at substantially right angles to the pot chuckslide.

12. In a crankshaft grinding machine as claimed in claim 2, thecombination with the parts and features therein specified, of anadjusting means between said face plate and said pot chuck plateincluding a fixed pivot stud extending through both of said plates, afixed stud on the said chuck plate located diametrically oppositethereto, said latter stud extending through a clearance aperture in saidface plate having a pair of aligned spaced adjusting screws on said faceplate which are arranged to engage opposite faces of said fixed stud tofacilitate a lateral adjustment of said chuck plate relative to saidface plate so that the path of adjustment of the axis of a crankshaftsupported in said pot chuck intersects the axis of said spindle.

13. In a crankshaft grinding machine as 15 claimed ,irlV claim .2, `thecombinationwith the partsandfeatres therein Sp`ecied,:cf an `adjustingYmeansbetween said face'plate Vand said pot chuck plate including as'xedpivot stud extending' through both of said plates, a fixed stud on saidchuck plate located ldiametrically Opposite Vthereto,'said 'latterstudextending through? a clearanceaperture in 'said face plate having` apairY. of aligned spaced adjusting screws on said face 16 ing crankpinshaving predetermined throws, a crankshaft aligning mechanism includinglan ad-A justable 'shoejl precise means for adjusting said shoe to locatesaid shoe for aligning a crankpin of predetermined diameter so thatitsvaxis coin-v cides with the axis of said spindles, a, visiblem-fdicating mechanism including a dial vindicator Wherebythe concentricityof a'crankpin may; be readily determined, a slidable mount for saidindicator whereby it may be readilymoved to and' from an operativeposition, a Workl contacting member, andmeans. including alever'connecting said member' with said d ial indicator, and precisionmeans for moving saidindicator precisely to a predetermined operatingpositon corresponding with the diameter of the crankpin .to be ground. wl f j AALBERT C+.BELDEN.1Y l Y Y CARLG.FLYGARE. v'OIVYAE.HILL.

